Finding the Fourth Proportional to 65,432.72, 90,294.88 and 39,981.69

Step by Step Solution

1. Step 1: Write the proportion equation
   65,432.72 : 90,294.88 = 39,981.69 : x
2. Step 2: Convert to fraction form
   65,432.72/90,294.88 = 39,981.69/x
3. Step 3: Cross multiply
   65,432.72x = 90,294.88 × 39,981.69
4. Step 4: Simplify right side
   65,432.72x = 3,610,141,900.75
5. Step 5: Solve for x
   x = 3,610,141,900.75/65,432.72
6. Step 6: Final answer
   x = 55,173.34